Aluminum Brazing

Definition

Brazing is a metal joining process which utilizes the inter-atomic attraction between two pieces of metal to form a bond that approaches parent metal strength. This is accomplished by “wetting” the metals to be joined with molten metal which, upon cooling, forms the joint.

> 800 DegF is termed Brazing and < 800 DegF is termed Soldering

Welding differs from brazing in that the base metals to be joined are molten at the moment of joining.

Aluminum filler metals are used to braze aluminum base metals using various methods, the most common being:

• Salt dip bath
• Vacuum
• Flux (either torch or furnace)